NEWHALEM, WASHINGTON

Period of Record General Climate Summary - Growing Degree Days

Station:(457690) SKAGIT POWER PLANT
From Year=1909 To Year=1958
Growing Degree Days for Selected Base Temperature (F)
Base Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Annual
40 M 8 31 105 296 521 629 799 783 611 346 91 22 4243
40 S 8 39 144 440 961 1590 2390 3173 3784 4130 4221 4243 4243
45 M 1 6 36 165 367 479 644 628 461 203 25 3 3019
45 S 1 7 43 209 575 1055 1699 2328 2788 2991 3017 3019 3019
50 M 0 1 10 73 222 330 489 473 313 91 3 0 2006
50 S 0 1 11 84 307 637 1126 1600 1912 2003 2006 2006 2006
55 M 0 0 2 25 110 191 336 319 181 28 0 0 1192
55 S 0 0 2 27 137 328 663 983 1164 1191 1192 1192 1192
60 M 0 0 0 7 42 86 193 177 86 5 0 0 596
60 S 0 0 0 7 49 135 328 505 591 596 596 596 596
Corn Growing Degree Days
50 M 1 11 57 172 300 356 476 466 342 149 20 2 2351
50 S 1 12 70 241 541 897 1372 1838 2180 2329 2349 2351 2351
M = Monthly Data
S - Running sum of monthly data.
Growing Degree Day units are computed as the difference between the daily average temperature and the base temperature. (Daily Ave. Temp. - Base Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is above the base temperature. Negative numbers are discarded. Example: If the days high temperature was 95 and the low temperature was 51, the base 60 heating degree day units is ((95 + 51) / 2) - 60 = 13. This is done for each day of the month and summed.
Corn Growing Degree Day units have the limitations that the maximum daily temperatures greater than 86 F are set to 86 F and minimums less than 50 F are set to 50 F.
Table updated on Oct 31, 2012
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered
Western Regional Climate Center, wrcc@dri.edu